Add 81/21 and 70/27
1st number: 3 18/21, 2nd number: 2 16/27
81/21 + 70/27 is 1219/189.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 27 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 21 × 9 = 189,
81/21 = 81 × 9/21 × 9 = 729/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
70/27 = 70 × 7/27 × 7 = 490/189 - Add the two like fractions:
729/189 + 490/189 = 729 + 490/189 = 1219/189 - So, 81/21 + 70/27 = 1219/189
In mixed form: 685/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/42+70/27 81/21+70/54 81/63+70/27 81/21+70/81